Understand Supported IP Protocols for Umbrella Cloud Delivered Firewall

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Updated:October 31, 2025
Document ID:225352

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    Introduction

    This document describes which IP protocols Umbrella Cloud Delivered Firewall (CDFW) can support and the impact of unsupported protocols.

    Overview

    Umbrella Cloud Delivered Firewall (CDFW) supports only TCP, UDP, and ICMP traffic sent to and from the internet. CDFW silently drops all other protocols from the IP protocol suite without logging these drops in the Umbrella dashboard.

    Impacts of Unsupported Protocols

    • Applications that use a layer 4 protocol other than TCP, UDP, or ICMP can fail when sending traffic through CDFW.
    • The protocol numbers for supported IP Protocol Suite protocols are:
      • ICMP: 1
      • TCP: 6
      • UDP: 17
    • You can check the IP protocol number by inspecting the Protocol field in the layer 3 (IPv4 or IPv6) header using Wireshark.
    • For example, a protocol with the number 46 is not supported by CDFW:

    46 Not Supported

    Revision History

    Revision Publish Date Comments
    1.0
    31-Oct-2025
    Initial Release
    TAC Authored

    Contributed by Cisco Engineers

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